1045 steel bar is a plain carbon steel product containing nominally 0.45% carbon. It is a very common engineering steel materials.
1045 steel bar has a low through hardening capability with sections up to around 60mm only generally recommended as suitable for through hardening and tempering. It can, however, be successfully flame or induction hardened in the as-rolled or normalised condition resulting in surface hardnesses of up to Rc 54 – Rc 60 depending upon quenching medium employed, type of setting up, section size etc. Core strengths will remain as supplied.
1045 steel lacks suitable alloying elements and hence does not respond to the nitriding process.
Applications
1045 is widely used for all industrial applications requiring more wear resistance and strength. Typical applications of AISI 1045 are as follows:
| Gears | Pins | Rams |
| Shafts | Rolls | Sockets |
| Axles | Spindles | Worms |
| Bolts | Ratchets | Light gears |
| Studs | Crankshafts | Guide rods |
| Connecting rods | Torsion bars | Hydraulic clamps |
Related Specifications:
Australia: AS 1442 – 1992 1045,
Germany: W.Nr 1.0503 C45, W.Nr 1.1191 CK45
Great Britain: BS970- 080A47, 080M46, EN43B
Japan: JIS G 4051 S45C
USA: AISI C1045, ASTM A29/A29M 1045, SAE 1045, UNS G 10450
Chemical Composition
| Element | Content |
|---|---|
| Carbon, C | 0.420 – 0.50 % |
| Iron, Fe | 98.51 – 98.98 % |
| Manganese, Mn | 0.60 – 0.90 % |
| Phosphorous, P | ≤ 0.040 % |
| Sulfur, S | ≤ 0.050 % |
Physical Properties
| Physical Properties | Metric | Imperial |
|---|---|---|
| Density | 7.87 g/cc | 0.284 lb/in3 |
Mechanical Properties
| Mechanical Properties | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 163 | 163 |
| Hardness, Knoop (Converted from Brinell hardness) | 184 | 184 |
| Hardness, Rockwell B (Converted from Brinell hardness) | 84 | 84 |
| Hardness, Vickers (Converted from Brinell hardness) | 170 | 170 |
| Tensile Strength, Ultimate | 565 MPa | 81900 psi |
| Tensile Strength, Yield | 310 MPa | 45000 psi |
| Elongation at Break (in 50 mm) | 16.0 % | 16.0 % |
| Reduction of Area | 40.0 % | 40.0 % |
| Modulus of Elasticity (Typical for steel) | 200 GPa | 29000 ksi |
| Bulk Modulus (Typical for steel) | 140 GPa | 20300 ksi |
| Poissons Ratio (Typical For Steel) | 0.290 | 0.290 |
| Shear Modulus (Typical for steel) | 80 GPa | 11600 ksi |
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